1.7.2 Memory configurations Asus prime Asus M3A78-EM

Page: 28 from 108

background image

1-16

Chapter 1: Product introduction

1.7 

System memory

1.7.1.

Overview

The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory 

Modules (DIMM) sockets.  
A DDR2 module has the same physical dimensions as a DDR DIMM but has a 

240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are notched 

differently to prevent installation on a DDR DIMM socket.
The figure illustrates the location of the DDR2 DIMM sockets:

Channel

Sockets

Channel 1

DIMM_A1 and DIMM_A2

Channel 2

DIMM_B1 and DIMM_B2

1.7.2 

Memory configurations

You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered ECC/non-ECC 

DDR2 DIMMs into the DIMM sockets.

Recommended memory configurations

Sockets

Mode

DIMM_A1

DIMM_B1

DIMM_A2

DIMM_B2

Single-Channel

Populated

Populated

Dual-channel.(1)

Populated

Populated

Dual-channel.(2)

Populated

Populated

Populated

Populated

M3A78-EM 240-pin DDR2 DIMM Sockets

R

M3A78-EM

DIMM_B1

DIMM_A2

DIMM_B2

DIMM_A1

128 Pins

11

2 Pins